using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ocsp
{
	public class Request
		: Asn1Encodable
	{
		private readonly CertID			reqCert;
		private readonly X509Extensions	singleRequestExtensions;

		public static Request GetInstance(
			Asn1TaggedObject	obj,
			bool				explicitly)
		{
			return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
		}

		public static Request GetInstance(
			object obj)
		{
			if (obj == null || obj is Request)
			{
				return (Request)obj;
			}

			if (obj is Asn1Sequence)
			{
				return new Request((Asn1Sequence)obj);
			}

			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
		}

		public Request(
			CertID			reqCert,
			X509Extensions	singleRequestExtensions)
		{
			if (reqCert == null)
				throw new ArgumentNullException("reqCert");

			this.reqCert = reqCert;
			this.singleRequestExtensions = singleRequestExtensions;
		}

		private Request(
			Asn1Sequence seq)
		{
			reqCert = CertID.GetInstance(seq[0]);

			if (seq.Count == 2)
			{
				singleRequestExtensions = X509Extensions.GetInstance(
					(Asn1TaggedObject)seq[1], true);
			}
		}

		public CertID ReqCert
		{
			get { return reqCert; }
		}

		public X509Extensions SingleRequestExtensions
		{
			get { return singleRequestExtensions; }
		}

		/**
		 * Produce an object suitable for an Asn1OutputStream.
		 * <pre>
		 * Request         ::=     Sequence {
		 *     reqCert                     CertID,
		 *     singleRequestExtensions     [0] EXPLICIT Extensions OPTIONAL }
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(reqCert);

			if (singleRequestExtensions != null)
			{
				v.Add(new DerTaggedObject(true, 0, singleRequestExtensions));
			}

			return new DerSequence(v);
		}
	}
}
